JP2010154184A - Loudspeaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a loudspeaker device for suppressing vibration of a magnetic circuit portion while suppressing the magnetic influence on the magnetic circuit portion. <P>SOLUTION: The loudspeaker device 1 having a vibrating portion 7 and generating sounds based on the vibration of the vibrating portion 7 includes: a magnetic circuit portion 6 for forming a magnetic field to vibrate the vibrating portion 7; and a weight portion 3 fixed on the magnetic circuit portion 6 and suppressing the vibration of the magnetic circuit portion 6 receiving a repulsive force caused by the vibration of the vibrating portion 7. The weight portion 3 is fixed to the magnetic circuit portion 6 via a coupling portion 8B for coupling the magnetic circuit portion 6 to the weight portion 3 so that a predetermined space for magnetically partitioning the magnetic circuit portion 6 and the weight portion 3 may be formed between the magnetic circuit portion 6 and the weight portion 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker device that generates sound.

  In principle, in a speaker device, a diaphragm is vibrated by a current flowing through a magnetic circuit and a voice coil from a magnetic circuit unit including a magnet, thereby generating sound. Here, the magnetic circuit unit is, so to speak, vibrates the diaphragm, and is preferably installed fixedly against the vibration of the diaphragm. However, in actuality, when the speaker is driven, the magnetic circuit unit itself may be placed in some vibration state due to the repulsive force from the diaphragm, and the sound quality of the speaker device may deteriorate.

  Therefore, in order to suppress the vibration of the magnetic circuit unit due to the repulsive force, a technique for suppressing the vibration of the magnetic circuit unit by additionally attaching a weight to the magnetic circuit unit has been proposed (for example, Patent Document 1). See). In this technology, a drop in sound quality of the speaker device is suppressed by additionally fitting a bowl-shaped iron weight into the magnetic circuit portion of the speaker device.

In addition, due to the rapid spread of electronic devices today, the number of electronic devices arranged adjacent to speaker devices is increasing. For this reason, the technique which suppresses the magnetism which leaks from a speaker apparatus and suppresses the influence which it has on a surrounding electronic device is proposed (for example, refer to patent documents 2). In this technique, a magnetic resistance material is interposed between the magnetism-proofing magnet and the shield cover, thereby suppressing magnetism leaking from the speaker device.
JP 2002-152848 A JP-A-62-38100

  In order to improve the sound quality in the conventional speaker device, when a weight is additionally provided in the magnetic circuit portion, vibration of the magnetic circuit portion can be effectively suppressed by adopting a weight having a large mass. . Metal-based materials can be cited as high-mass materials that can effectively suppress vibrations in the magnetic circuit section, but many of the metal-based materials are ferromagnetic materials. There is concern about the influence of the circuit on the magnetism.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a speaker device that suppresses the vibration of the magnetic circuit unit while suppressing the magnetic influence on the magnetic circuit unit.

  In order to solve the above problems, in the present invention, the weight portion is connected via a coupling portion that couples the magnetic circuit portion and the weight portion so as to form a predetermined space that magnetically separates the magnetic circuit portion and the weight portion. Was fixed to the magnetic circuit section. Specifically, the speaker device includes a vibration unit and generates sound by vibration of the vibration unit, and the magnetic circuit unit forms a magnetic field for vibrating the vibration unit, and is fixed to the magnetic circuit unit. A weight portion that suppresses vibration of the magnetic circuit portion that receives a reaction force due to vibration of the vibration portion, and the weight portion is provided between the magnetic circuit portion and the weight portion. The magnetic circuit unit is fixed to the magnetic circuit unit via a coupling unit that couples the magnetic circuit unit and the weight unit so that a predetermined space that magnetically separates the unit is formed.

The above-described speaker device generates sound when the vibration unit vibrates in the magnetic field formed by the magnetic circuit unit. Here, the vibration unit generates air by moving air,
Since the device itself has a mass, the magnetic circuit unit that vibrates the vibration unit inevitably gives vibration. When the magnetic circuit part vibrates due to the reaction force from the vibration part, the driving force transmitted from the magnetic circuit part to the vibration part is attenuated and the sound quality deteriorates. To suppress this, the weight part is fixed to the magnetic circuit part. Is done. The weight portion has a mass that can resist the repulsive force that the magnetic circuit portion receives due to the vibration of the vibration portion and contribute to maintaining the sound quality of the speaker device.

  Here, in the speaker device, the weight portion is fixed to the magnetic circuit portion by the coupling portion, so that the vibration of the magnetic circuit portion is transmitted to the weight portion. The coupling portion couples the magnetic circuit portion and the weight portion in a state where a predetermined space that magnetically separates the magnetic circuit portion and the weight portion is formed therebetween. The weight portion is fixed to the magnetic circuit portion by such a coupling portion, so that vibration of the magnetic circuit portion can be suppressed in a state where the magnetic circuit portion and the weight portion are magnetically separated from each other. . Therefore, it is possible to suppress the vibration of the magnetic circuit part while suppressing the magnetic influence of the magnetic circuit part due to the weight part being fixed to the magnetic circuit part. Here, the predetermined space is a magnetic space formed between the magnetic circuit portion and the weight portion, for example, a space that magnetically insulates the magnetic circuit portion and the weight portion.

  The vibration unit includes a coil through which an electrical audio signal flows, and the magnetic circuit unit includes a magnet unit and a yoke unit that guides the magnetic flux of the magnet unit to a space where the coil is disposed. And the weight portion is configured to couple the magnetic circuit portion and the weight portion in a state where the coupling portion sandwiches a spacer made of a non-magnetic material between the yoke portion and the weight portion. Thus, the magnetic circuit unit may be fixed in a state where the predetermined space is formed. In the speaker device configured as described above, since the yoke portion is coupled to the weight portion with the spacer interposed therebetween, the reaction force transmitted from the vibrating portion to the yoke portion is transmitted to the weight portion via the spacer, and the magnetic circuit portion. Is effectively suppressed. Moreover, since the weight part is being fixed to the magnetic circuit part via the nonmagnetic material, it is possible to suppress the vibration of the magnetic circuit part while suppressing the magnetic influence on the magnetic circuit part.

  Further, the weight portion is moved from the magnetic circuit portion to the weight portion based on the correlation between the strength of the magnetic field formed in the space where the coil is disposed and the vibration suppression effect of the magnetic circuit portion by the weight portion. The spacer may be fixed to the magnetic circuit portion via the spacer in a state in which the distance between the magnetic circuit portion and the weight portion is adjusted by the length of the spacer in the direction toward the head. In the case of the speaker device configured as described above, the influence of the magnetic field on the magnetic circuit unit is reduced when the weight unit is separated from the magnetic circuit unit, and the vibration is suppressed by fixing the weight unit close to the magnetic circuit unit. It is possible to make fine adjustments from the viewpoint of optimizing the sound quality of the speaker while balancing the two conflicting elements, so it is easy to cope with variations in the acoustic characteristics of each product. Can do.

  The vibration unit includes a coil through which an electrical audio signal flows, and the magnetic circuit unit includes a magnet unit and a yoke unit that guides the magnetic flux of the magnet unit to a space where the coil is disposed. The weight portion couples the magnetic circuit portion and the weight portion in a state where the magnetic coupling portion suppresses the magnetic flux leaking from the magnetic circuit portion between the yoke portion and the weight portion. Accordingly, the magnetic circuit unit may be fixed to the magnetic circuit unit in a state where the predetermined space is formed between the magnetic circuit unit and the weight unit. In the case of the speaker device configured as described above, since the yoke portion is coupled to the weight portion with the magnetic shield portion interposed therebetween, the reaction force transmitted from the vibrating portion to the yoke portion is transmitted to the weight portion via the magnetic shield portion, and magnetic The vibration of the circuit unit is effectively suppressed. In addition, since the magnetic shield part is sandwiched between the magnetic circuit part and the weight part so that the magnetic flux of the magnetic circuit part is not affected by the weight part, the magnetic circuit is suppressed while suppressing the magnetic influence on the magnetic circuit part. It is possible to effectively suppress the vibration of the part.

The weight portion may be coupled to the magnetic circuit portion by a screw made of a nonmagnetic material. In the speaker device configured as described above, the magnetic circuit portion and the weight portion are firmly coupled to each other through screws, so that the vibration of the magnetic circuit portion is reliably transmitted to the weight portion, and the magnetic force to the magnetic circuit portion is increased. Can be suppressed.

  It is possible to provide a speaker device that suppresses the vibration of the magnetic circuit unit while suppressing the magnetic influence on the magnetic circuit unit.

  Hereinafter, embodiments of the present invention will be described. In addition, each embodiment shown below shows concrete embodiment of this invention exemplarily, and does not limit the scope of rights of this invention.

  FIG. 1 is a diagram showing an internal structure when the speaker device 1 according to the first embodiment is viewed from the right side. As shown in FIG. 1, the speaker device 1 includes a speaker unit 2 that converts an electrical signal into sound, an anchor 3 (corresponding to a weight portion in the present invention) that suppresses vibration of the speaker unit 2, and a stay that supports them. 4 is provided. The speaker unit 2 is basically the same as a conventional general speaker, and the voice coil 5 uses the magnetic field of the magnetic circuit unit 6 to mount the diaphragm 7 (corresponding to the vibrating unit in the present invention). By vibrating, the diaphragm 7 vibrates air and makes a sound. Since the speaker unit 2 is connected to the anchor 3 on the back side, the vibration of the diaphragm 7 is transmitted to the anchor 3 as it is. The speaker unit 2 is connected to the stay 4 via the anchor 3, thereby supporting the speaker unit 2.

  The anchor 3 is an iron weight having a cylindrical outer shape in which one end side in the longitudinal direction is narrowed, the thin side faces the back side of the speaker device 1 and the other end connected to the speaker unit 2 faces the front side. As shown in FIG. The reason why the anchor 3 is made of iron is that it is superior to materials such as stainless steel in terms of cost and workability. The anchor 3 has a mass necessary for suppressing unnecessary vibration of the magnetic circuit unit 6 due to repulsive force from the diaphragm 7. The anchor 3 is coupled to the yoke 11 of the magnetic circuit unit 6 to be structurally integrated, thereby suppressing unnecessary vibration of the magnetic circuit unit 6. A flange 9 having a hole through which a fixing screw 8A for connecting to the stay 4 is inserted is provided on the outer peripheral surface of the anchor 3, and the speaker unit 2 is fixed to the central axis portion of the anchor 3. For this purpose, a hole through which a fixing screw 8B (corresponding to the connecting portion in the present invention) is inserted is provided. When the anchor 3 is fitted into the hole of the stay 4, the flange 9 comes into contact with the back surface of the stay 4. The anchor 3 is fixed to the stay 4 by attaching a fixing screw 8A in this state. In addition, the anchor 3 is not only coupled to the stay 4 via the fixing screw 8A in this way, but the anchor 3 may be integrally formed with the stay 4.

  FIG. 2 is an enlarged view of a main part of the internal structure of the speaker device 1 shown in FIG. As shown in FIG. 2, the speaker unit 2 includes a so-called outer magnet type magnetic circuit unit 6 having an annular main magnet 10. The magnetic circuit unit 6 includes a center pole 13 composed of a disk-shaped yoke 11 and a columnar pole 12 protruding from the center of the yoke 11, and an annular plate 14 that circulates around the pole 12. ing. An annular plate 14 that circulates around the pole 12 forms a gap 15 that is a minute gap with the pole 12. In addition, the main magnet 10 is disposed between the plate 14 and the yoke 11. The main magnet 10 is a permanent magnet. Here, the center pole 13 and the plate 14 are made of ferromagnetic iron. For this reason, the magnetic circuit unit 6 includes a main magnet 10, a yoke 11, a pole 12, a gap 15, and a plate 14, and forms a magnetic circuit that passes through these in order and returns to the main magnet 10 again. The main magnet 10 is arranged so that the front side of the speaker device 1 is the S pole and the back side is the N pole.

  A frame 18 that supports the diaphragm 7 is fixed to the front side of the plate 14. The diaphragm 7 is connected to the frame 18 via an edge 16 formed of a deformable elastic member attached to the outer peripheral side and a damper 17 attached to the inner peripheral side. The edge 16 and the damper 17 are connected to each other. Within a certain deformable range, it can move relative to the magnetic circuit section 6. The diaphragm 7 has a bobbin 19 around which the voice coil 5 is wound. The bobbin 19 and the voice coil 5 are inserted into the gap 15. Since the magnetic field formed by the magnetic circuit unit 6 is formed in the gap 15, a force that drives the diaphragm 7 in the front-rear direction acts when electricity flows through the voice coil 5. That is, when an electric audio signal is passed through the voice coil 5, the diaphragm 7 generates a vibration based on the waveform of the electric audio signal due to the interaction between the magnetic field of the gap 15 and the voice coil 5 through which the electric audio signal flows. .

  An annular cancel magnet 20 is disposed on the back side of the yoke 11 so that the N pole faces the front side and the S pole faces the back side. The cancel magnet 20 is a permanent magnet. Further, the cancel magnet 20 and the magnetic circuit unit 6 are accommodated in a cylindrical shield cover 21 having one end opened so that the magnetism of the magnetic circuit unit 6 does not leak to the surroundings. Note that a hole for enabling the yoke 11 and the anchor 3 to be coupled is provided at the center of the shield cover 21.

  Here, the speaker unit 2 is coupled to the anchor 3 via the spacer 22 and the fixing screw 8B. Specifically, a screw hole of a fixing screw 8B is provided at the center of the back side of the yoke 11, and the spacer 22 fitted in the hole of the anchor 3 is brought into contact with the back side of the yoke 11 so that the speaker unit 2 Is coupled to the anchor 3. Thus, when the yoke 11 and the anchor 3 of the speaker unit 2 are coupled, the reaction force applied to the diaphragm 7 from the surrounding air when the diaphragm 7 vibrates and emits sound around the frame 7 18 and the voice coil 5 are transmitted to the magnetic circuit unit 6 to vibrate the magnetic circuit unit 6. However, since the anchor 3 having a predetermined mass is fixed to the yoke 11 of the magnetic circuit unit 6 via the spacer 22, the reaction force transmitted from the diaphragm 7 to the magnetic circuit unit 6 is sufficient due to the mass of the anchor 3. And the deterioration of the sound quality of the speaker device 1 due to the vibration of the magnetic circuit unit 6 is suppressed. The predetermined mass is a mass that can resist the reaction force that the magnetic circuit unit 6 receives due to the vibration of the diaphragm 7 and contribute to maintaining the sound quality of the speaker device.

  By the way, the spacer 22 is made of aluminum which is a nonmagnetic material. Here, if the spacer 22 is formed of ferromagnetic iron or the like, a part of the magnetic flux of the magnetic circuit unit 6 reaches the anchor 3 via the spacer 22, and a magnetic field is generated around the speaker device 1. Will be formed (see FIG. 3). However, in the speaker device 1 according to the present embodiment, the spacer 22 is formed of aluminum which is a non-magnetic material, and the spacer 22 serves as a magnetoresistor, so that a magnetic circuit as shown in FIG. Magnetic flux does not flow from the part 6 to the anchor 3. Accordingly, a part of the magnetic flux that should originally contribute to the formation of the magnetic field of the gap 15 does not enter the anchor 3, so that the strength of the magnetic field formed in the gap 15 is not attenuated. As a result, a space (corresponding to a predetermined space in the present invention) is formed between the anchor 3 and the magnetic circuit portion 6 so as to magnetically separate them.

According to the speaker device 1 configured as described above, since the vibration of the magnetic circuit unit 6 and the influence on the magnetism of the magnetic circuit unit 6 are suppressed, it is possible to reproduce high-quality sound. In addition, since the magnetism leaking around the speaker device 1 is also reduced, it is possible to satisfy the magnetic-shielding standard and the like. In the above embodiment, aluminum is exemplified as the non-magnetic material for the spacer 22, but the present invention is not limited to such a material. As a nonmagnetic material that can be used as the spacer 22, for example, brass, resin, or the like can be used. Moreover, in the said embodiment, although the polarity of the main magnet 10 is arrange | positioned so that a front side may become a south pole and a back side may become a north pole, the polarity may be reverse. In this case, it is necessary to reverse the polarity of the cancel magnet 20. In the above embodiment, iron, which is a ferromagnetic material, is used as the material of the fixing screw 8B. However, the fixing screw 8B may be formed of stainless steel, which is a nonmagnetic material, like the spacer 22. If the fixing screw 8B is formed of a non-magnetic material, it is possible to more reliably suppress the magnetism that goes around from the magnetic circuit portion 6 to the anchor 3. Further, in the above embodiment, the speaker device 1 is configured by the outer magnet type magnetic circuit unit 6. However, the present invention is not limited to this, and for example, a so-called inner magnet type magnetic circuit unit. It is also possible to configure.

  Moreover, in the said embodiment, although the spacer 22 was comprised with the nonmagnetic material, this invention is not limited to such a material. For example, the spacer 22 may be formed of a magnetic material such as a permanent magnet. FIG. 5 is a diagram showing the flow of magnetic flux when the spacer 22 is formed of a permanent magnet. In this modification, a permanent magnet is used for the spacer 22, and the polarity of the spacer 22 is set to be in the same direction as the polarity of the cancel magnet 20 as shown in FIG. 5. That is, the polarity of the spacer 22 is set so that the N pole faces the front side and the S pole faces the back side. Similar to the cancel magnet 20, the spacer 22 is arranged so as to prevent magnetism from leaking from the magnetic circuit unit 6, thereby providing the same operational effects as the above-described embodiment in which the spacer 22 is made of a non-magnetic material. Is possible. However, since the magnetic flux of the spacer 22 that plays the role of a cancel magnet passes through the anchor 3, the magnetic shielding performance of the speaker device 1 is slightly inferior to that of the above embodiment. However, since at least the magnetism of the magnetic circuit section 6 is prevented from entering the anchor 3, the magnetic field strength of the gap 15 can be kept sufficiently.

  FIG. 6A is a diagram showing an internal structure when the speaker device 51 according to the second embodiment is viewed from the right side. The same name and code | symbol are attached | subjected about the component similar to 1st embodiment mentioned above, and the detailed description is abbreviate | omitted. Similar to the speaker device 1 according to the first embodiment, the speaker device 51 according to the present embodiment, as shown in FIG. 6A, includes a speaker unit 2, an anchor 52 that suppresses vibration of the speaker unit 2, and a stay 4 that supports them. It has. Since the structure of the speaker unit 2 and the stay 4 is the same as that of the first embodiment described above, the description thereof is omitted.

  Unlike the anchor 3 of the speaker device 1 according to the first embodiment, the anchor 52 of the speaker device 51 according to the present embodiment is not provided with a hole for fitting the spacer 22. Other points are the same as those of the anchor 3 according to the first embodiment. In the speaker device 1 according to the present embodiment, as shown in FIG. 6A, the anchor 52 and the speaker unit 2 are connected without the spacer 22 as in the speaker device 1 according to the first embodiment. Therefore, the front side of the anchor 52 is in contact with the back side of the shield cover 21 of the speaker unit 2.

  According to the speaker device 51 configured as described above, the vibration of the magnetic circuit unit 6 is transmitted to the anchor 52 via the cancel magnet 20 and the shield cover 21. Therefore, the reaction force transmitted from the diaphragm 7 to the magnetic circuit unit 6 is sufficiently canceled out by the mass of the anchor 52, and the deterioration of the sound quality of the speaker device 51 due to the vibration of the magnetic circuit unit 6 can be suppressed. Moreover, since the magnetism which goes around from the magnetic circuit part 6 to the anchor 3 is suppressed by the cancel magnet 20, attenuation of the strength of the magnetic field of the gap 15 caused by the magnetism of the magnetic circuit part 6 going around to the anchor 3 is suppressed. Therefore, according to the speaker device 51, the vibration of the magnetic circuit unit 6 and the influence on the magnetism of the magnetic circuit unit 6 are suppressed, so that high-quality sound can be reproduced.

In this embodiment, the material of the fixing screw 8B is preferably nonmagnetic material such as aluminum or brass, but it is also possible to use ferromagnetic material such as iron. In this embodiment, the shield cover 21 is sandwiched between the anchor 52 and the cancel magnet 20, but the present invention is not limited to such an embodiment. That is, the anchor 52 may be in direct contact with the cancel magnet 20.

  In the present embodiment, the case where the shield cover 21 and the anchor 52 are in surface contact is illustrated in FIG. 6A, but the present invention is not limited to this. For example, as shown in FIG. 6B, an annular rib 53 may be provided on the shield cover 21 to reduce the contact area between the shield cover 21 and the anchor 52. Since a magnetic resistance is generated between the shield cover 21 and the anchor 52 by the rib 53, the magnetic flux leaking from the magnetic circuit unit 6 by the cancel magnet 20 is more effectively suppressed, and the magnetic field strength of the gap 15 is increased. Is possible.

  FIG. 7 is a diagram showing an internal structure when the speaker device 101 according to the third embodiment is viewed from the right side. The same name and code | symbol are attached | subjected about the component similar to 1st embodiment mentioned above, and the detailed description is abbreviate | omitted. As in the speaker device 1 according to the first embodiment, the speaker device 101 according to the present embodiment includes a speaker unit 2, an anchor 102 that suppresses vibration of the speaker unit 2, and a stay 4 that supports them, as shown in FIG. 7. It has. Since the structure of the speaker unit 2 and the stay 4 is the same as that of the first embodiment described above, the description thereof is omitted.

  FIG. 8 is an enlarged view of a main part in which the magnetic circuit unit 6 and its peripheral part of the speaker device 101 according to the present embodiment are enlarged. Unlike the anchor 3 of the speaker device 1 according to the first embodiment, the anchor 102 of the speaker device 101 according to the present embodiment is a screw hole in which the spacer 22 is fitted. Further, the anchor 102 and the speaker unit 2 are connected by a spacer 103 having a screw portion. The speaker device 101 according to the present embodiment can adjust the distance between the speaker unit 2 and the anchor 102 by rotating the spacer 103.

  If the space between the speaker unit 2 and the anchor 102 is reduced, the magnetic field leaking from the magnetic circuit unit 6 to the anchor 102 increases, so that the magnetic field of the gap 15 is weakened, but the vibration of the magnetic circuit unit 6 is more effectively suppressed. . On the other hand, if the space between the speaker unit 2 and the anchor 102 is widened, the effect of suppressing the vibration of the magnetic circuit unit 6 is slightly lost, but the magnetism leaking from the magnetic circuit unit 6 to the anchor 102 is reduced, so the magnetic field of the gap 15 is reduced. Becomes stronger. When it is desired to close the space between the speaker unit 2 and the anchor 102, the fixing screw 8B is removed and the speaker unit 2 is detached from the anchor 102. Then, the spacer 103 is rotated to the right to be screwed into the speaker unit 2. It fixes to the anchor 102 again with the fixing screw 8B. On the other hand, when it is desired to widen the distance between the speaker unit 2 and the anchor 102, the fixing screw 8B is removed and the speaker unit 2 is detached from the anchor 102, and then the spacer 103 is rotated counterclockwise so that the screw comes out. 2 is fixed to the anchor 102 again with the fixing screw 8B.

  According to the speaker device 101 according to the present embodiment, since the distance between the speaker unit 2 and the anchor 102 can be adjusted, the variation in the acoustic characteristics of each product is adjusted in addition to the same effects as the above embodiments. It is possible to reproduce a good quality sound. FIG. 9 is a graph showing the correlation between the distance between the speaker unit 2 and the anchor 102 and the magnetic flux in the gap 15. As shown in FIG. 9, the speaker unit 2 and the anchor 102 contribute to the improvement of the magnetic field strength of the gap 15 as the distance between the speaker unit 2 and the anchor 102 increases, but the effect gradually decreases. Therefore, if the distance between the speaker unit 2 and the anchor 102 can be adjusted as in the present embodiment, the position where the optimum sound quality is obtained from the correlation between the vibration suppression effect of the anchor 102 and the magnetic field strength improvement effect of the gap 15. It becomes possible to adjust both to the relationship.

  The means for adjusting the distance between the anchor 102 and the speaker unit 2 is not limited to that realized by the spacer 103 having such a screw portion. For example, a thin plate for adjusting the interval may be sandwiched between the speaker unit 2 and the anchor 102 together with the spacer 103 to adjust the interval between them, or a large number of spacers 103 of various sizes may be provided. You may prepare and select the most suitable one.

The internal structure figure of the speaker apparatus which concerns on 1st embodiment. The principal part enlarged view which expanded the magnetic circuit part of the speaker apparatus which concerns on 1st embodiment, and its peripheral part. The figure which shows the flow of the magnetic flux in case a spacer is a ferromagnetic body. The figure which shows the flow of the magnetic flux of the speaker apparatus which concerns on 1st embodiment. The figure which shows the flow of the magnetic flux of the speaker apparatus which concerns on the modification of 1st embodiment. The internal structure figure of the speaker apparatus which concerns on 2nd embodiment. The principal part enlarged view which expanded the magnetic circuit part and its peripheral part of the speaker apparatus which concerns on the modification of 2nd embodiment. The internal structure figure of the speaker apparatus which concerns on 3rd embodiment. The principal part enlarged view which expanded the magnetic circuit part of the speaker apparatus which concerns on 3rd embodiment, and its peripheral part. The graph which showed the correlation with the distance of a speaker and an anchor, and the magnetic flux of a gap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,51,101 ... Speaker apparatus 2 ... Speaker unit 3,52,102 ... Anchor 6 ... Magnetic circuit part 7 ... Diaphragm 8A, 8B ... Fixing screw 10 ... Main magnet 11 ... Yoke 15 ... Gap 20 ... Cancel magnet 22, 103 ... Spacer

Claims (5)

A speaker device having a vibration part and generating sound by vibration of the vibration part,
A magnetic circuit section for forming a magnetic field for vibrating the vibrating section;
A weight portion that is fixed to the magnetic circuit portion and suppresses vibration of the magnetic circuit portion that receives reaction force due to vibration of the vibration portion, and
The weight portion couples the magnetic circuit portion and the weight portion so that a predetermined space for magnetically separating the magnetic circuit portion and the weight portion is formed between the magnetic circuit portion and the weight portion. Fixed to the magnetic circuit part through a coupling part
Speaker device. The vibration unit has a coil through which an electrical audio signal flows,
The magnetic circuit unit includes a magnet unit and a yoke unit that guides the magnetic flux of the magnet unit to a space in which the coil is disposed.
The weight portion is formed by joining the magnetic circuit portion and the weight portion in a state where the coupling portion sandwiches a spacer made of a non-magnetic material between the yoke portion and the weight portion. Fixed to the magnetic circuit portion in a state where the predetermined space is formed,
The speaker device according to claim 1. The weight portion is a direction from the magnetic circuit portion toward the weight portion based on the correlation between the strength of the magnetic field formed in the space where the coil is disposed and the vibration suppression effect of the magnetic circuit portion by the weight portion. The distance between the magnetic circuit portion and the weight portion is adjusted by the length of the spacer, and is fixed to the magnetic circuit portion.
The speaker device according to claim 2. The vibration unit has a coil through which an electrical audio signal flows,
The magnetic circuit unit includes a magnet unit and a yoke unit that guides the magnetic flux of the magnet unit to a space in which the coil is disposed.
The weight portion is formed by joining the magnetic circuit portion and the weight portion in a state where the magnetic coupling portion suppresses the magnetic flux leaking from the magnetic circuit portion between the yoke portion and the weight portion. , And is fixed to the magnetic circuit portion in a state where the predetermined space is formed between the magnetic circuit portion and the weight portion.
The speaker device according to claim 1. The weight portion is fastened to the magnetic circuit portion by a screw made of a nonmagnetic material.
The speaker device according to any one of claims 1 to 4.

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